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Immunohistochemistry analysis of CD-31 expression in the four skin transplantation groups. (A) On day 7, more blood vessels were formed in the three adipose-derived stem cell (ADSC) injection groups than in the control group. (B) On day 21, the number of blood vessels was larger in the three experimental groups than in the control group (×400). (C) Quantification of the expression of CD-31 in the four groups (**: P < 0.0001).
